completelycharged
Active member
- Joined
- Mar 7, 2018
- Messages
- 1,083
Ok, this is not a sales pitch, been on the search for a cheap, good way to get 12V and 24V from my packs and stumbled upon some boards, which appear to be brilliant for powerwall use. I have seen various posts over time where 12V or 24V has been required and not a lot at a sensible price is available.
Having tried and blown a lot of cheap boards, some where the FET's can't even handle relatively small capacitors attached and looking for something that is not expensive and capable of some abuse. Think this board may be an absolute ideal bargain, due to it being sold as a spare/redundand part ? Ideal to feed 12V LED floodlights with.
They are sold by different sellers so have a look and check wider search for pricing and sources
https://www.aliexpress.com/item/4000089035197.html
Priced around 4 for a 30A converter, listed at $82 each on DigiKey (HPH-12/30-D48N-C) and 76 on the UK site !
Looking up the specification sheet for the board the features appear to be quite impressive and stunning for a 4 board
View attachment 1
With the isolation it could be possible to add 4 of them in series and get a 48V isolated (and current limited to 30A) output, which could make for a safe test connection that limits the maximum draw to 1.5kW. This could be where 4 of them end up for me when experimenting, however in series they could face a different set of issues.
Good Points
1. The board has isolated output, so add two in series to get 24V
2. Parallel them up to as many as you need
3. Automatic current limiting (see page 9 because it is not CC/CV so not a good choice to charge with)
4. Remote sense voltage correction (page 10) to prevent voltage drops on your supply cables
5. Seems to be able to cope with a lot of abuse
6. Can switch on/off remotely pulling one pin to the -ve line (but not when in series with common switch)
7. Input range 39V - 75V (to properly cope with full load regulation)
8. Over 94% efficient for 10A-30A load with 48Vin
9. MTBF of 1.4 million hours !
Bad Points
1. No load power is listed in the specifications as 150mA or 7.2W, which is quite high - the main big down side if only needing a few W !!!
2. No heatsink provided to use at full load for a long time but spec page 6 seems to say ok for 25A with no fan
3. =>10,000uF capacitor would appear as a short circuit
Note on the efficiency (see page 6 of the spec)the idle power is the equivalent of 2% at full load or 7W so if your only pulling 7W with an LED for example it would then appear to be just 50% efficient, however increase to 100W and that 7W is no longer as large a factor. The 36V efficiency is even better than the 94% at 48V.
I have 10 on order (4.73 each inc postage) and post a follow up once I have had a good try at abusing them, they do seem like an absolute bargain. lots of experiments...
Having tried and blown a lot of cheap boards, some where the FET's can't even handle relatively small capacitors attached and looking for something that is not expensive and capable of some abuse. Think this board may be an absolute ideal bargain, due to it being sold as a spare/redundand part ? Ideal to feed 12V LED floodlights with.
They are sold by different sellers so have a look and check wider search for pricing and sources
https://www.aliexpress.com/item/4000089035197.html
Priced around 4 for a 30A converter, listed at $82 each on DigiKey (HPH-12/30-D48N-C) and 76 on the UK site !
Looking up the specification sheet for the board the features appear to be quite impressive and stunning for a 4 board
View attachment 1
With the isolation it could be possible to add 4 of them in series and get a 48V isolated (and current limited to 30A) output, which could make for a safe test connection that limits the maximum draw to 1.5kW. This could be where 4 of them end up for me when experimenting, however in series they could face a different set of issues.
Good Points
1. The board has isolated output, so add two in series to get 24V
2. Parallel them up to as many as you need
3. Automatic current limiting (see page 9 because it is not CC/CV so not a good choice to charge with)
4. Remote sense voltage correction (page 10) to prevent voltage drops on your supply cables
5. Seems to be able to cope with a lot of abuse
6. Can switch on/off remotely pulling one pin to the -ve line (but not when in series with common switch)
7. Input range 39V - 75V (to properly cope with full load regulation)
8. Over 94% efficient for 10A-30A load with 48Vin
9. MTBF of 1.4 million hours !
Bad Points
1. No load power is listed in the specifications as 150mA or 7.2W, which is quite high - the main big down side if only needing a few W !!!
2. No heatsink provided to use at full load for a long time but spec page 6 seems to say ok for 25A with no fan
3. =>10,000uF capacitor would appear as a short circuit
Note on the efficiency (see page 6 of the spec)the idle power is the equivalent of 2% at full load or 7W so if your only pulling 7W with an LED for example it would then appear to be just 50% efficient, however increase to 100W and that 7W is no longer as large a factor. The 36V efficiency is even better than the 94% at 48V.
I have 10 on order (4.73 each inc postage) and post a follow up once I have had a good try at abusing them, they do seem like an absolute bargain. lots of experiments...