KID controller

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ws9876
ws9876 Solar Expert Posts: 440 ✭✭✭
in Off Grid Solar & Battery Systems #1
If you hooked a KID controller up to an adjustable benchtop 12 -30v DC power supply for testing and put 18 or21or 26 volts to the KID  would it
start up normally and allow conversion to any standard battery voltage below  the input?? what about above the voltage??
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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #2
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    Controllers generally use battery power to establish nominal voltage parameters, which is why connection to the battery first, is required. The output would be whatever the settings allow for the particular nominal voltage, the inputs maximum voltage would determine what nominal output output could be used, in the case of 30V maximum a 12V nominal output would be the maximum, in most cases . MPPT controllers are buck type devices, not boost, so the output could never be higher than the input
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,439 admin
    #3
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    In general, connect solar chargers to the battery back first with good batteries (12 volt bank, 9 to 18 volts is typical requirement). If the back voltage is too low or too high the controller may not start or may choose the incorrect bank voltage (for auto select controllers).

    For mppt controllers, the Vpanel voltage should generally be 1.3x battery charging voltage.

    14.75 bikes charging x 1.3 = 19.2 volts minimum

    For actual mppt function.

    Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #4
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    Many MPPT controllers will run into trouble if you try to "fake" solar PV from a power supply or battery.  A few models may allow this operation, but generally, they assume they are working against a Current Source and try to control the power by adjusting the MPPT point, which cannot happen with a stiff power supply or battery, and so the stronger device (not always the most expensive device) wins.
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

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  • Vic
    Vic Solar Expert Posts: 3,208 ✭✭✭✭
    #5
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    I have run a KID CC  with a Vin of 24 VDC  from a Switching power supply  (SMPS),  charging a 12 V L-16 battery.   No problems observed.

    Used "Legacy O & P"  Mode in the KID,   and set the current Limit to 26 A (of the 30 A Max).

    There are several caveats,   in general:

       The maximum input current available from the SMPS should not exceed the the Maximum output current of the MPPT CC,.
       Probably,  the Vin from the SMPS should not exceed Vbat by more than 1.5 or 2X.

       SMPS input voltage sources are probably better,   in general,   as many of them have output current limiting/protection,  compared to a Transformer-Rectifier-Capacitor configuration,   which could have uncontrolled Isc.

    AND,   be prepared for some failure that might not be covered under Warranty.

    Just opinions,   FWIW.   Vic

    Off Grid - Two systems -- 4 SW+ 5548 Inverters, Surrette 4KS25 1280 AH X2@48V, 11.1 KW STC PV, 4X MidNite Classic 150 w/ WBjrs, Beta KID on S-530s, MX-60s, MN Bkrs/Boxes.  25 KVA Polyphase Kubota diesel,  Honda Eu6500isa,  Eu3000is-es, Eu2000,  Eu1000 gensets.  Thanks Wind-Sun for this great Forum.
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