question

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ash13-mx asked

Adaptive charge, absorption time, temperature compensation & sensor.

Hi,

I am getting a bit confused with the amount of information I am trying to take in so I thought I would join the community for some guidance, so thank you in advance.

I am on a easy solar 1600 24v system, 2x Rolls 290a, 50 Charge controller.

When using the formula, I managed to calculate an absorption time of 46mins (rounded up to 1hr)
Does this sound right?
T = 0.38 x C /I
0.475 = 0,38 x 260ah / 208

If this is incorrect then where have I gone wrong? Also, if I am using adaptive charge then does this figure matter?

I also was confused regarding temperature compensation - I saw that the compensation should be set at -4mV/ºC/Cell - so i have set this at-32V/ºC - is this correct?

The system has a temperature sensor, how do I know that it is even working?

Could you also advise on the absorption and float voltages please?
After looking through the manuals I settled for -
Absorption Voltage - 29.40V
Float Voltage - 27.60V
Max Charge Current - 50A

Also, i set the system to 'charge only' when I got to bed, in the morning despite the batteries reading at 24.8+ the system wont turn on until there is a bit of sun to top up the charge, or i need to turn the gene on to allow a top up... It could be for 5 mins and the system turns back on again and doesn't seem to be lacking charge at all.. is there something I have accidentally mis-configured when I was using veconfigure? I've noticed Victron connect app is not a comprehensive as Veconfigure or am i missing something by plugging into the charge controller?

Please excuse the basic questions but I have already fried one set of these batteries in 3 years and it was an expensive mistake i can let happen again... trying my best to get studying again : )

Thanks,

Ash

EasySolar All-in-Onetemperature compensation
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1 Answer
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kevgermany answered ·

Assuming your batteries are AGM

Solar.this will not start charging until panel voltage is 5V higher than the actual battery voltage. So your comment sounds like normal operation

Stick to battery manufacturer settings for the charging. Leave the absorption on adaptive. No need to change the default 8 hours max. Absorption time needed varies from day to day depending on use and conditions.

Easysolar is a housing with two main components inside, a solar controller and an inverter/charger. These need to be configured separately with the same battery parameters.

Yes connect and configure are separate products with differing levels of functionality.

Temp sensor is on the inverter/charger only. If you have an easysolar with GX display screen, the sensor values are in there. Otherwise you won't see it on a Bluetooth connection, but will using the MK3 USB cable to your pc.

To add temp compensation to the solar side, you need an extra sensor for the solar controller. It is not the same as the one you have and I think it's a cover off job to cable. You might find the socket for it is already wired up, not sure you need to check. I didn't bother on mine. I just set the solar charge voltage to the lower end of the battery maker's range. For me it's irrelevant in winter as there is so little sun.

Temp compensation. Six cells in 12V, 12 in 24 V. So in your case 48mV/C.


Hope I haven't missed anything, if so or not clear, ask!



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Related Resources

EasySolar 1600 product page

EasySolar-II GX 3000 & 5000 product page

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