Forum Discussion
BFL13
Nov 07, 2014Explorer II
jrnymn7 wrote:
"Whatever controller you get, make sure it has adjustable high set point. IMO ignore temp comp except for long term storage battery Float. While camping you can play with the Vabs if especially hot or cold out."
Yeah, I was thinking I could make any temp adjustments manually, throughout the year, just like with my charger.
If I understand correctly, that Eco-W 20a mppt has a set point adjustment of 13-15.5v... except they call it "Constant voltage (Over charge) voltage".
And I'm guessing "max discharge current" only applies to a direct load off the controller, not from the bank?
The Eco -W has two voltage adjustments. the Vabs goes to 15.5 but the Float only goes to 14.5. As soon as battery voltage reaches the set Vabs it drops to float. No time at Absorb. So the trick to stay at your say, 14.8 Vabs a couple hours would be to sset Float the same as Vabs at 14.8. but you can't set it above 14.5.
It turned out that my 6s did great on that 14.8 then 14.5 rest of day and kept up baseline SG when full. No equalizing needed.
The T-1275s didn't do well at that. They want longer at 14.8 or else maybe even higher.
Meanwhile the Solar30 has the one setting for Vabs to 15v highest, and once batts get there it stays there till dark. Vabs is the float.
what I liked was the thing was not calibrated that well, so it went 0.5v higher than set. So if I wanted 14.8 I set 14.3. No problem. Even better, if I set 15 it would do 15.5 and equalize! :) Niner says his goes above setting too the same way. Once yiu know the index error you can allow for it. Be a bummer if it went below setting though.
I never had my Eco-W do 19.9 and 20.0 amps so I can't say if it would clip the amps at 20 if it got more in. Some MPPT controllers do clip the amps at rating so they will not overheat.
PWM 12v controllers will pass through more amps than rated and overheat, so you are supposed to have some margin there in case the panel is doing better than its rating. 20% margin is recommended, so if your array can do 20a at STC, then allow 20% =5a and use a 25a controller.
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