Charge Controller/panel location
andy300z
Solar Expert Posts: 39 ✭
Hello. I am setting up my ttl of 320 watts panels going to a tristar mppt 60amp
controller. My panels are on my main house but my bank and controller are in a shed 50 feet away. I noticed that my shed seems to get good amount of sun after 1pm. My questions is:
1. I am thinking about installing another string of panels on the shed can i used
another charge controller going to the same battery bank ?
2. Can i use different charge controller e.g mppt & pww on the same bank ?
3. Can i used a series string and a parrallel string going to a pv combiner ?
Thanks and have a happy new year.
controller. My panels are on my main house but my bank and controller are in a shed 50 feet away. I noticed that my shed seems to get good amount of sun after 1pm. My questions is:
1. I am thinking about installing another string of panels on the shed can i used
another charge controller going to the same battery bank ?
2. Can i use different charge controller e.g mppt & pww on the same bank ?
3. Can i used a series string and a parrallel string going to a pv combiner ?
Thanks and have a happy new year.
Comments
-
Re: Charge Controller/panel location1. I am thinking about installing another string of panels on the shed can i used another charge controller going to the same battery bank ?
You can connect multiple charge controllers to the same battery bank (the +/- common bus connection point).
I would worry if you have a lot of charging current (over 20-30% of Bank AH capacity) that you might overheat the bank.
Otherwise, you should be OK. You will find that the charge controllers go through their 3 stages or so at different times... They will not go from Bulk to Absorb to Float at the same time.2. Can i use different charge controller e.g mppt & pww on the same bank?
No problem. As long as each MPPT/PWM controller is proper configured with the Solar PV Array and Battery Bank (per their instruction manuals)--There is no issue between the differing charge controllers.3. Can i used a series string and a parallel string going to a pv combiner ?
Yes you can--But you should try to match series connection Imp within 10% (series connection--increasing voltage)... And match parallel connection Vmp within ~10% (parallel connections add current).
What panels (Vmp/Imp) are you trying connect? It can be simple or complex depending on how many and what ratings of panels you are trying to connect.
I can give you examples, but it is probably easier to explain your situation first.
-Bill
Thanks and have a happy new year.[/QUOTE]Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset -
Re: Charge Controller/panel location
yes, yes, and the last yes with the comment below.
if you are referring to using pvs at a much higher vmp than the battery voltage that would suffice for an mppt controller be it for example a 24v pv going to a 12v battery or 2 12v pvs in series going to a 12v battery, then i'd say not unless you do have the downconverting controller. using a pwm controller would lose too much of the available power even though it would work. -
Re: Charge Controller/panel location
Bill:
You wrote: "I would worry if you have a lot of charging current (over 20-30% of Bank AH capacity) that you might overheat the bank..."
My battery bank is 110 amp (4 6volts Exide GC batteries in series)
My MX60 rated output is 60 amp, but my panels (6 130 watts Kyoceras, in series parallel) output should be around 18 amp max.
Is this ok?
My dumb question is: Is the MX60 pumping 60 amps to my batteries or just 18 (panel's max)?
Thanks -
Re: Charge Controller/panel location
Just the rated panel power.
The 60 amps is the maximum the outback is rated to output.
-BillNear San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset -
Re: Charge Controller/panel locationYou can connect multiple charge controllers to the same battery bank (the +/- common bus connection point).
I would worry if you have a lot of charging current (over 20-30% of Bank AH capacity) that you might overheat the bank.
Otherwise, you should be OK. You will find that the charge controllers go through their 3 stages or so at different times... They will not go from Bulk to Absorb to Float at the same time.
No problem. As long as each MPPT/PWM controller is proper configured with the Solar PV Array and Battery Bank (per their instruction manuals)--There is no issue between the differing charge controllers.
Yes you can--But you should try to match series connection Imp within 10% (series connection--increasing voltage)... And match parallel connection Vmp within ~10% (parallel connections add current).
What panels (Vmp/Imp) are you trying connect? It can be simple or complex depending on how many and what ratings of panels you are trying to connect.
I can give you examples, but it is probably easier to explain your situation first.
-Bill
Bill this is what i am trying to achieve
i have one string (4) 80w Mono panels with a vmp of 17.5 @ a imp of 4.57a . I have it connected in series on my main roof . I have another set of (4) 40w amorphous panels whitch a vmp of 44.6v @ imp of 0.92a.
Instead of buying another charge controller can i feed these two strings into my
tristar mppt 60amp controller.
The only reason i am using the amorphous panels beacuse it works great in lowlight situation.
Thanks -
Re: Charge Controller/panel locationBill this is what i am trying to achieve
i have one string (4) 80w Mono panels with a vmp of 17.5 @ a imp of 4.57a . I have it connected in series on my main roof . I have another set of (4) 40w amorphous panels with a vmp of 44.6v @ imp of 0.92a.
Instead of buying another charge controller can i feed these two strings into my
tristar mppt 60amp controller.
The only reason i am using the amorphous panels because it works great in lowlight situation.
Thanks- 4x 17.5Vmp= 70 Vdc Vmp-array
- 2x 44.6 volts = 89.2 Vdc Vmp-array
Trying paralleling the 4x40 watt panels then placing them in series with the 4x80 watt panels (parallel/series connections):- 4x 0.92 Imp-amps = 3.68 amps @ 44.6 volts
- 3.68 amps (parallel 40 watt panels) / 4.57 amps (series 80 watt panels) = 0.80 (getting pretty far from 0.9 to 1.1 ratio of matching Imp)
- 70 VDC (80 watt panels in series) + 44.6 volts (40 watt panels in parallel) = 114.6 volts Vmp (standard conditions)
Otherwise, short of a second MPPT controller, I do not see a good way of "efficiently" connecting these panels together behind one controller.
You can try the first method (4x80 panels in series , then paralleled with a pair of 2x40 watt panels in series / parallel connection). If you get more energy it may be worth it for you...
But you will have to monitor the TS 45 MPPT controller output... MPPT Controllers are not designed to have two or more peak Pmp production levels on the Current/Voltage curve--It is very possible for the controller to make a mistake and "track" the wrong local power peak (i.e., track the first peak it finds, and miss the second higher peak power output).
-BillNear San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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