Motorhome Forums, Motorhome Discussion, Motorhome Chat - Reply to Topic

Thread: Battery Dead or something else I should check? Reply to Thread
Title:
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now



In order to be able to post messages on the Motorhome Forums, Motorhome Discussion, Motorhome Chat forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
17-09-2020 22:53
Penquin
Quote:
Originally Posted by Bryce Lawrence View Post
It's only 12V.

Isotherm CRUISE EL 85

https://www.webasto.com/fileadmin/we...idges-2017.pdf

Sorry for. my previous post, I am totally unfamiliar with Isotherm fridges so cannot help you sort out your problem. The fridges certainly look energy efficient and would be something that I may well look at if ever my Dometic reaches it's "best before" date.

I hope that you can work it out, there has to be a simple wiring fault causing a load to be dumped. Can you put a multimeter into the battery circuit and check the discharge ? Is it possible that you have a fault in the solar controller or the pabels themselves ? I am literally,bworking from first principles, probably like you.

Good luck, please come back and tell us - such information is always good to acquire.
17-09-2020 21:31
raynipper OK and thanks. In that case I give up.

Ray.
17-09-2020 21:28
Bryce Lawrence
12V Fridge

Quote:
Originally Posted by raynipper View Post
OK but can you enlighten us as to the power of the fridge and is it ONLY 12v?

Ray.
It's only 12V.

Isotherm CRUISE EL 85

https://www.webasto.com/fileadmin/we...idges-2017.pdf
17-09-2020 20:53
eurajohn
Quote:
Originally Posted by raynipper View Post
OK but can you enlighten us as to the power of the fridge and is it ONLY 12v?

Ray.
Something like this Ray https://www.ludospace.com/webasto-el...4v-c2x20187462.

.
17-09-2020 20:17
raynipper OK but can you enlighten us as to the power of the fridge and is it ONLY 12v?

Ray.
17-09-2020 19:59
Bryce Lawrence
Quote:
Originally Posted by Penquin View Post
Agree totall with Ray; you SHOULD have three ways of powering your fridge;

1. Mains voltage (240 v nominally), this should be used WHENEVER POSSIBLE to prechill the fridge before a trip and during any trip where mains EHU is available,

2. 12v this is the most inefficient way of cooling the fridge, the current drain is too high for solar panels even here in the very sunny South of France at mid-day, 12v should ONLY be used while the engine is actually running and the wiring should prevent any other use of the 12v system for cooling, if not then there is a SERIOUS fault in the wiring. The 12 v is so inefficient that the fridge thermostat is bypassed while on 12 v so the fridge in theory gets colder and colder,

3. Gas, this should be used when the vehicle is on a site IF NO MAINS EHU AVAILABLE, but only if, it may require extra cooling fans for really efficient operation in hot weather but is VERY efficient at cooking the fridge down (it actually puts in about four times as much cooking power than even mains EHU. It must NEVER be used while underway cure to a serious fire risk in the event of a road traffic collision. Seen one MH burn out within 7 minutes, fortunately we were able to get the sole occupant out just before the cylinders exploded.

Please use this as fairly fundamental advice, you CANNOT operate your fridge from solar panels - they only deliver their maximum output when the sun is directly overhead - and how often does that happen each day ? Of course, there is absolutely NO charge if cloudy, raining, evening, ,orning or night in other words most of the 24/7. Our twin 85w panels + a portable 7w panel deliver just over 4.5a here at mid-day but we have recently had most days in the mid 30's....... with full sun and zero cloud and a <1% chance of rain during the day. Can you match those conditions ?
My 260W panels keep my battery fully charged on a rainy day at about 20 degrees, so the battery is only needed at night. In 100% perfect conditions, my panels need no more than 2 hours to supply a full days fridge consumption. Typically the battery is fully charged by lunchtime.
17-09-2020 19:55
Bryce Lawrence
Quote:
Originally Posted by eurajohn View Post
He states at the start, the van is fitted with a 12 volt fridge, it is popular now to fit 12 volt compressor fridges not 3 way.

They consume far less current than a 3 way absorption.

The normal consumption quoted for this type of fridge is around 260w in 24 hours.

Unfortunately I can't help with his dilemma though.

.
yep, you are correct, mine is rated to consume about 385Wh per 24 hours at 25 degrees. No gas, 240V. If I plug into shore power, then it charges the battery and the fridge runs off the battery still. Manufacture states 200 AH AGM battery, using 50% battery capacity, is good for 3-4 days.

I have calculated my requirements to run everything. I have over spec'd my solar panels Wattage requirements by about 100% to ensure I have enough power on rainy days. Based on the power generated in the first two months, the power generated from the panels is not the problem.

My panels can push 20 AMPs into the battery.
17-09-2020 08:45
eurajohn He states at the start, the van is fitted with a 12 volt fridge, it is popular now to fit 12 volt compressor fridges not 3 way.

They consume far less current than a 3 way absorption.

The normal consumption quoted for this type of fridge is around 260w in 24 hours.

Unfortunately I can't help with his dilemma though.

.
16-09-2020 22:51
Penquin Agree totall with Ray; you SHOULD have three ways of powering your fridge;

1. Mains voltage (240 v nominally), this should be used WHENEVER POSSIBLE to prechill the fridge before a trip and during any trip where mains EHU is available,

2. 12v this is the most inefficient way of cooling the fridge, the current drain is too high for solar panels even here in the very sunny South of France at mid-day, 12v should ONLY be used while the engine is actually running and the wiring should prevent any other use of the 12v system for cooling, if not then there is a SERIOUS fault in the wiring. The 12 v is so inefficient that the fridge thermostat is bypassed while on 12 v so the fridge in theory gets colder and colder,

3. Gas, this should be used when the vehicle is on a site IF NO MAINS EHU AVAILABLE, but only if, it may require extra cooling fans for really efficient operation in hot weather but is VERY efficient at cooking the fridge down (it actually puts in about four times as much cooking power than even mains EHU. It must NEVER be used while underway cure to a serious fire risk in the event of a road traffic collision. Seen one MH burn out within 7 minutes, fortunately we were able to get the sole occupant out just before the cylinders exploded.

Please use this as fairly fundamental advice, you CANNOT operate your fridge from solar panels - they only deliver their maximum output when the sun is directly overhead - and how often does that happen each day ? Of course, there is absolutely NO charge if cloudy, raining, evening, ,orning or night in other words most of the 24/7. Our twin 85w panels + a portable 7w panel deliver just over 4.5a here at mid-day but we have recently had most days in the mid 30's....... with full sun and zero cloud and a <1% chance of rain during the day. Can you match those conditions ?
16-09-2020 21:31
raynipper Haven't fully digested your tale of woe but are you saying your trying to power the van fridge on 12v and hoping the solar panel will maintain the battery 12v?

It won't work. The fridge will take about 20 amps and the solar panel might just put back 4 amps. That will result in a dead battery within a few hours.
The fridge needs to be on gas when not travelling.

Ray.
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

 
For the best viewing experience please update your browser to Google Chrome