I'd really love to get my hands on Re:Load Pro and burn some watt-hours in style for no particular reason. Sadly, it's sold out since a long time now. When could I expect a new batch to arrive at Tindie?

We're still working on stock - but it looks like it's at least 6 weeks away.

So 6 weeks away was about 2 weeks ago. Any update?

Any update on this? I'd prefer to support this project if it is on the horizon, but I'm going to need to get something in the fairly near future.

Sorry for the delay responding. We're looking at touching off a new run as soon as possible, but we first have to find the upfront capital for 200 units, which as you can imagine is quite a bit for a small business. We should have an update on the blog in the next couple of weeks.

Hello,
is this project still alive? Are you going to produce more Re:Load Pro devices? I am very interested in getting two units! There is no real alternative out there, everything is either a toy or extremely expensive.

Yes! We're (finally!) doing a new run Real Soon Now. We may also have a very few extra units we found on Tindie soon, keep your eyes peeled.

Thanks for the quick answer! I'll be watching Tindie for it to show up.

A few quick questions on the side:

• Are constant-resistance and/or constant-power (as in Watt) modes available/planned/possible?

• What is the lowest current it can reliably and accurately draw?

• With what granularity can the current be set?

• Are current ripple measurements at low and high loads available anywhere?

• Can complex loads (waveforms or just a set frequency) be programmed somehow? Through its USB port?

• Is an external trigger input to activate the load available? Or could one be added? Are any extra GPIO pins available on the µC and routed to test pins for such further expansions?

• Can the load be turned on and off? An old review mentions that this was missing at the time.

Are constant-resistance and/or constant-power (as in Watt) modes available/planned/possible?

They're possible, albeit with a slower software feedback loop rather than in hardware. They're in the bugtracker, but there's no immediate plans to implement.

What is the lowest current it can reliably and accurately draw?
With what granularity can the current be set?

To answer both questions, approximately 10mA with calibration. If you want a lower power but more accurate R:LP, you can replace the shunt resistor with something bigger!

Are current ripple measurements at low and high loads available anywhere?

I measured these for the datasheet, but don't have graphs available. Since it's an opamp-based feedback loop, there's no ripple in stable state besides what the PSU injects; the main measurement for active loads is how they respond to load and voltage transients.

Can complex loads (waveforms or just a set frequency) be programmed somehow? Through its USB port?

You can adjust the load dynamically via USB. Since it's not a bipolar device, you're limited to positive values, so any waveform would have to have a DC offset.

Is an external trigger input to activate the load available? Or could one be added? Are any extra GPIO pins available on the µC and routed to test pins for such further expansions?

One GPIO pin is routed to a (currently unused) jack on the front panel, which could be used for exactly this with some firmware modifications.

Can the load be turned on and off? An old review mentions that this was missing at the time.

Yes, this is now supported!

They're possible, albeit with a slower software feedback loop rather than in hardware. They're in the bugtracker, but there's no immediate plans to implement.

OK. Maybe we'll look into that ourselves. Should be relatively simple.

To answer both questions, approximately 10mA with calibration. If you want a lower power but more accurate R:LP, you can replace the shunt resistor with something bigger!

OK. Guess I could even just add a switch.

You can adjust the load dynamically via USB. Since it's not a bipolar device, you're limited to positive values, so any waveform would have to have a DC offset.

One GPIO pin is routed to a (currently unused) jack on the front panel, which could be used for exactly this with some firmware modifications.

That sounds like a feasable solution. When testing supplies I am mostly interested in transient response and behaviour under rapidly changing loads, so those would be very useful features.

Thanks for the incredibly quick and competent responses!

One last question, can you estimate how much shipping for one or for two units to Germany would be? I need to get approval from our hackerspace in advance so that if they become available I can place the order right away.

One last question, can you estimate how much shipping for one or for two units to Germany would be? I need to get approval from our hackerspace in advance so that if they become available I can place the order right away.

It's hard to say - we're changing fulfillment providers, and future units will be shipped from the US. I haven't yet negotiated a shipping rate with our new store/fulfillment company for this product. I'll let you know when I know, in a week or so.