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If I have one solar panel, and four 12v batteries I need to be charged, two pairs of equal age and capacity (60 amp hour x 2, and 50 amp hour x 2) and the pairs have the same resting voltage and seemingly the same capacity, and I can get a solar charger unit which can charge two batteries (see link below), I was thinking of charging each pair in parallel. I've read about the risks of charging in parallel, with the weaker battery having the dominant impact and bringing the other battery down to its capacity, but in reality, how likely is this to be a problem in the course of 5 years, where the batteries won't be used that much anyway, maybe discharged 20%, just 10 times a year? I'm conscious there is scope to discuss lots of things around this, like "buy pairs of new batteries rather than starting out with old ones" and "buy larger capacity new batteries etc", but this is the set up we have and will be sticking with. Thanks for any replies. James https://uk.rs-online.com/web/p/solar-power-regulators/9054536?cm_mmc=UK-PLA-DS3A-_-google-_-PLA_UK_EN_Power_Supplies_And_Transformers-_-Renewable_Energy|Solar_Power_Regulators-_-PRODUCT_GROUP&matchtype=&pla-391749164546&s_kwcid=AL!7457!3!243856857002!!!g!391749164546!&gclid=CjwKCAiAu9vwBRAEEiwAzvjq-zrEd9pZ-QRkhK-Tpfd6UJFYhRnC8sQOzas0oXPQXq3zr44tGo3_MhoC_XcQAvD_BwE&gclsrc=aw.ds
Several questions, sorry. 1. is there a way to trickle charge multiple batteries from one trickle charging unit (where a 240v mains supply is available)? 2. is there a way to trickle charge multiple batteries from one trickle charging unit (where there is only access to a solar panel and no mains feed)? 3. in the situations above (1 and 2) does it matter that there is a combination of battery types (wet lead-acid and deep cycle gel batteries)? 4. can anyone recommend a weatherproof solar panel to drive this potential setup? 5. can anyone recommend a trickle charger to run off a solar panel to charge multiple 12v batteries? Batteries currently: 2 x wet lead-acid batteries (50-60 amp hour each); but these could go in time. 2 x gel deep cycle batteries (80 amp hour); very old and again could go in time. 2 x gel deep cycle batteries (110 amp hour); eventually will end up with just these at the observatory. Background: We have an observatory with no mains power. The mount runs at 24v, lighting at 12v. We are looking for solutions to trickle charge the batteries on site, and avoid the need of someone having to lug the 110 amp hour batteries away each time the observatory is used. The smaller batteries are being used as these are easier to carry, but the goal would be to end up with just the two large deep cycle batteries for the mount, and maybe one or two of the other batteries for lighting or to provide a 12v feed to someone who may bring a scope and save them bring power too. We don't want to explore wind power for the time being. Thanks for any replies.
Ok, I hold my hands up, slightly off topic but I discovered a great daytime use for my EQ3 mount and just had to share. Very suited to the job...If your in to solar power I made this vid this week. Explains it better than me typing (about quarter way through). Excuse my waffling about all things 12v http://www.youtube.com/watch?v=5U92h-2HAyw Thanks for watching