Wednesday, May 06, 2015 at 23:03
n. I have just fitted my new GSL mppt 60-1
Solar regulator and a Victron Shunt to 3 x 120ah new AGM batteries
[1]. I have 2 x 200w panels. My power draw would be below 80ah/day.
The batteries are not charging beyond 12.9v by the end of a sunny day. By early evening the reading is down to 12.1 and in the morning is down to 11.8v?
[2] I checked readings with a multi-meter. I then checked the terminals where the + & - wires from the
solar panels enter the regulator.
This was reading 11.6 - 11.9v....at night!
My little brain doesn't think power should be flowing out to the panels at night? If this is the case would it explain why my batteries are draining so fast?
any help appreciated
Hi
[1] 400W of panel should easilyy cope with that on most days
[2]No use reading the input to the
Solar reg at night You need to read it when the panels are in
BRIGHT sun
[The reading you get at night is the battery voltage minus a small drop in the regulator]
Midday in
bright sun you should get a much higher reading at the
Solar cables to the regulator than the Battery voltage[ around 16<V]
Have you:
CHecked the instructions
set the regulator correctly , wired it in the correct order, & sequence[ sequence can be important ]
I would suggest disconnect the lot
Then
check;[a] EACH
solar panels output voltage in
bright sun with nothing connected depending on panels around 20<22V[
Check the panel specs]
If you have a current range on your meter
check the short circuit current of EACH panel
It should be bit over 12A again
check the panel specs
If your meter only has a 10A max you will need to that
test quickly before the internal fuse blows
A reading of 10A will be near enough for the purpose
Finally do you have a means of reading the actual charging current going into the battery [ between the reg & the battery]
PeterQ
PeterQ
AnswerID:
553399
Follow Up By: oldtrack123 - Wednesday, May 06, 2015 at 23:18
Wednesday, May 06, 2015 at 23:18
Hi
Cannot edit, but where ,how have you connected the Victron shunt
What does it measure ?
All current in or out of the battteries?
PeterQ
FollowupID:
839232