Guru
Joined: 21/06/2018
Location: AustraliaPosts: 1297
| Posted: 02:25pm 27 May 2026 |
The electrolytic capacitors on the MPPT power board are 35mm diameter, solder pins are "snap in", the snap in mounting hole centres are 10mm on the PCB.
C1, C2 are 3.5mm
All the ceramics are monolithic or film and are 0.2" or 5.08mm
All resistors are 0.4" or 10.16mm
The resistors are all 250 - 500mW, but R9 & R10 should be 600mW - 1W but the hole sizes are only ~0.9mm so some resistors could be tight. I think for R9 & R10, I used 2 x 22R 400mW in parallel ie bend the pins as if either could insert into the board & solder one in parallel to the other just where the legs exit the body so you insert the piggy backed resistors as 1 part. From memory the resistors ran hot - they were an attempt to reduce emi, if they run too hot try reducing C18 & C19 to 470p but with at least a 63 or 100V rating.