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DieselBurps's avatar
DieselBurps
Explorer
Oct 08, 2015

Ecoworthy MPPT + 6 volt batts

Just installed the ecoworthy controller with a 250 watt panel. I am trying to figure out what settings I should run ecoworthy on for my batteries. The batts are 2 6 volt Costco golf cart batteries. I believe they are interstate.

Here is what Interstate says,
Absorption voltage 7.65 so for wired as 12 volts that is 15.3 volts
Float voltage 6.7 so at 12 volts float should be 13.4 volts

I adjusted the absorption on the solar charge controller to 15.1 volts when I went to check on it later I noticed it started to smell like my batteries were boiling so I turned it down this morning to 14.8 and will check it again in a little bit.

Am I missing something here?

Also, there are a few other parameters you can set on the charge controller, So far I haven't delved into those, not sure I need to?

JiminDenver has been a huge help so far so a big shout out to him!

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  • BFL13's avatar
    BFL13
    Explorer II
    Oct 08, 2015
    I use an Eco-W with my 255w panel and Interstate 6v batts.

    That 15.3 is just for a shot of finishing at the end of the usual 14.8 stage. You don't use that with the solar. Also your inverter quits at anything over 15v.

    I set the absorption voltage to 14.8 and the Float voltage to 14.5 (highest it will go or else I would use 14.8) when there will not be much daylight time left after the batts reach 14.8. The batts then get some absorption time at 14.5v

    (The controller goes to float as soon as the batts reache the set absorption voltage.)

    When daylight is longer, so they get to 14.8 earlier in the day, I set the float voltage to 13.6 which helps keep the water in the batts

    The 6s do very well with that above settings. I check their SGs to confirm that.

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