The day I made the soap was a sunny day and I was ALL out of my laundry detergent. To most this would not be a concern, but because we are off-grid you learn to utilize all your resources. Our biggest resource back here in the wilderness is the SUN!!
We save a lot of chores and projects for sunny days. Not that we would absolutely have to, but we pride ourselves in being frugally conservative. This of course, is a choice. I could do wash on a cloudy day, but most chances are that some point in the day we would need to use the generator to recharge our batteries. This would require us to fuel up the generator and have it running for at least an hour. In our mind that is a waste of fuel and our hard earned money.